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Other circuits Circuits presented above are most commonly used. There are, however, other circuits. One of
them is binary subtractor. Presented in fig. 4. 1-bit subtractor realises operation Ai-Bi-Ci where Ci
signal is called borrow-out bit (borrow from current position to previous).
There are also specialised circuits called arithmetic-logic unit that realise many different
operations. One of them is TTL circuit 74181. This circuit realises e.g. addition, subtraction,
logical multiplication. The type of operation depends on signals on function inputs F3..F0 and M.
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